If this is still relevant, the easiest workaround for using the
raspberry pi bootloader directly and bypassing u-boot is to do the
following. (This is actually useful if you use a custom kernel, since
the needed dtb file for u-boot may not be the one you want to use for
your custom kernel.)
Do NOT uninstall u-boot.
edit /boot/firmware/config.txt so that all kernel lines are commented
out and make sure the [all] section has these two lines:
kernel=vmlinuz
initramfs initrd.img followkernel
Then create put the following text in
/etc/kernel/postinst.d/zzzz_rpi_kernel:
#!/bin/sh -eu
#
# This uncompresses the arm64 kernel so the rpi bootloader can load it.
#
# First exit if we aren't running an ARM64 kernel.
#
[ $(uname -m) != aarch64 ] && exit 0
#
KERNEL_VERSION="$1"
KERNEL_INSTALLED_PATH="$2"
gunzip -c -f ${KERNEL_INSTALLED_PATH} > ${KERNEL_INSTALLED_PATH}.nogz &&
mv -f ${KERNEL_INSTALLED_PATH}.nogz ${KERNEL_INSTALLED_PATH}
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https://bugs.launchpad.net/bugs/1811984
Title:
flash-kernel 3.90ubuntu3.18.10.1 fails with mkimage: not found if no
uboot is used
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